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日本广播公司技术研究所研制成一种光磁录象材料,其特点是具有录象和消象能力。该所研制的光磁录象盘为一玻璃盘,直径约15厘米,表面涂有约0.2微米厚的用钴化钆合金构成的磁性材料薄膜。这种录象盘能录制3分钟的单色图象。目前,这种录象盘正在引起人们的极大注意,并被誉为能实现反复录放象的视盘方面所取得的一项重大技术突破。制作这种录象盘时,须将0.2微米厚的钴化钆薄膜涂在玻璃基片上。制作录象盘最关键之处是提高磁性材料的灵敏度,并使涂膜均匀。用氦灯作光
Nippon Broadcasting Corporation Institute of Technology developed a magneto-optical video material, which is characterized by the ability to record and erase. The developed magneto-optical video disk is a glass disk with a diameter of about 15 cm coated with a thin film of magnetic material made of a gadolinium gadolinium alloy with a thickness of about 0.2 μm. This video disc can record 3-minute monochrome images. At present, such video discs are attracting great attention and being honored as a major technological breakthrough in the realization of video discs for repeated recording and reproducing. In making such a video disk, a 0.2 μm thick film of gadolinium gadolinium has to be applied to the glass substrate. The key to making a video disc is to increase the sensitivity of the magnetic material and to make the coating uniform. Use helium as light